| Iguanodectinae | |
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| Iguanodectes geisleri | |
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| Subfamily: | Iguanodectinae Eigenmann, 1909
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Iguanodectinae is a subfamily of small freshwater fish in the family Iguanodectidae. They are most prominently found in the Amazon river basin and its major tributaries, but they are also known from the Tocantins, Orinoco, and Paraguay rivers. It has two genera, Piabucus and Iguanodectes. Some species in the subfamily are taken from the wild for aquariums, like the red- and green-line lizard tetras (Iguanodectes geisleri and Iguanodectes spilurus, respectively). There is minor, but ongoing, debate regarding its taxonomy.